Verse 33. Moses went out of the city - Not only for privacy in his communion with God, but to shew that he durst venture abroad into the field, notwithstanding the hail and lightning, knowing that every hail-stone had its direction from God. Peace with God makes men thunder-proof, for it is the voice of their father. And spread abroad his hands unto the Lord - An outward expression of earnest desire, and humble expectation. He prevailed with God; but he could not prevail with Pharaoh; he sinned yet more, and hardened his heart - The prayer of Moses opened and shut heaven, like Elijah's. And such is the power of God's two witnesses, Rev. xi, 6. Yet neither Moses nor Elijah, nor those two witnesses, could subdue the hard hearts of men. Pharaoh was frighted into compliance by the judgment, but, when it was over, his convictions vanished.